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I don't know of a way to turn off the alert sound within HitFilm, but it might be a feature I haven't learned about yet. It is still working for me, though. Are you sure you didn't just miss it? Perhaps try rendering out a few frames real quick to see if it beeps this time? Or maybe alerts have been disable in your system settings somewhere?

If you wait until everyone else gets back into the office on Monday, one of them will likely have some insight. Since the programmers are the ones who make it beep at all, they ought to have an idea or two what might make it stop beeping.

The beep isn't anything HitFilm is explicitly doing; the program just displays a message dialog box when exporting is finished, and Windows is usually configured to play a beep sound when a message box appears.As to why that no longer happens, try checking your Sounds in the Windows Control Panel.